Cooking apparatus.



G. BELL. COOKING APPARATUS. APPLICATION FILED HOV. 7,1911.

Patented Aug. 5, 1913.

3 SHEETS-SHEET 1.

INVENTOR WITNESSES:

WW ATTORNEYS G. G. BELL. COOKING APPARATUS. APPLIUA'I'ION 111131111017.7, 1911.

Patented Aug. 5, 1913.

3 SHEETS-SHEET 2.

mvmmn WW/ML BY 7L 2 $15k WITNESSES:

G. G. BELL. COOKING APPARATUS. APPLICATION FILED NOV. 7, 1911.

1,069,376, Patented Aug. 5, 1913.

s sums-sum a.

WITNESSES: INVENTOR ATTORNEYS UNITED STATES PATENT orricnGEORGE:GILBERT'BELL, OF KEN SIN GTON, LONDON, ENGLAND, ASSIGNOR 7 HEATSTORAGE COMPANY, ACORIEORATION OF NEW.YORK.

r ELECTRIC CQOKING APPARATUS.

Specification of Letters Patent.

Patented Aug. 5, 1913.

To all whom it may concern:

Be it knownt'hat I, GEORGE GILBERT BELL, a subject of the King of GreatBritain, and a resident o'fKensington, London, England, have invented,certain --new and useful Improvements in Cooking Apparatus, of whichthe following is aspecification.

This invention relates to improvements in apparatus-for heating'air orother media by means of electricity, in which the electrical energy istransformed into'and-is stored in the form of heat to be used asrequired, preferably by using a heat accumulator or a mass ofmaterial-having a high'specific heatfva'lue and a high thermalconductivity such as Now-the present invention has for its ob jectto-pr-ovide meansefor promoting or increasing the circulation" of themedium in such an electrical coo-king apparatus. To

' this end the oven is arranged above the heat ,zag'paths for the air orthe duct may be provide .short time if necessary.

accumulator and is connected thereto by two pipes or ducts, one for theflow and the other for the return of the medium and in order to furtherincrease the circulation of the heated air or other medium, auxiliarymeans for causing a circulation such as an auxiliaryheater, is insertedin the flow pipe or conduit. Moreover an additional heater may bearranged in the oven near the top to' top heat or to heat quicklyfor aThe air duct may be provided with bafli-e plates to provide zi co-iledor otherwise arranged so as to deflect the air and cause it to impingeagainst the heated sides of the duct, such deflections serving to morethoroughly heat the air and dampers or valves may be provided forregrangement of heating apparatus.

According to the arrangement illustrated in Figs 1 and 2, the beataccumulator or mass at is in the form'of a parallelepiped and has acoiled air duct b cast therein. The air duct 12 emerges at one end atthe middle of the top of the heat accumulator a into the hot air supplypipe 0 which passes 'up into the oven arranged'immediateiy "abovethe'heat accumulator a. The return pipefe fonthe cooled air is led intothe other heat accumulator a so that the air is reheated in the duct 5.The heat accumulator a and oven d areeach'inelosed in a casing f of aheat insulating material which in turn is conveniently incased inacasing g of sheet metal or other suitable material. accumulator isfitted with a. heater in of known type'a-rranged in a recess in portionof the mass. In order'to still further improve the circulation of themedium, anenlargement 2' is suitably made, in the hotair supply pipe 0,at or near the point at which it leaves the heat accumulator a, tocontain an additional heater 7' which tends to set up additionalconvection currents in theair. The distribution of heat ifis.eflicientlycontrolled by dampers or valves A1 and l of any known typeand arranged'one at the outlet and the'other at the inlet of the airduct 12. 7

According to a modified and convenient arrangement as illustrated inFigs. 3 and 4:, the heat'accum'ulator a is also in the form-of, aparallelepiped and is provided with a heating element 71-. The said heataccumu' lator has a horizontal and preferably cylindrical-ail; ductprovided with' vertical plates m serving "as bathe-plates and suitablycast into the thermal mass or otherwise mounted in the duct 1) atintervals along its length, The said plates preferably have centralapertures through which is passed the central shaft or core. 12 andholes 0 are punched or drilled in the plates m, the holes in succeedingplates being out of alinement, so that thuszig-zag or tortuous paths areprovided for the air. The'hot-air supply pipe or duct 0 emerges at ornear the inner end of the air duct 6 at the lower part of the s The heatthe lower A end ofthe air duct 6 in the heataccumulator a and may passdirectly up intothe oven (Z which, as before, 18 arranged immediatelyabove the heat accumulator. The oven and heat accumulator are alsoincased in insulating material f. The return passage 6 for the cooledair, which passage is formed be tween the outersoveu door 7) and theinner oven door (7 connnunicatcs.\vith the oven by holes 1' in the ovendoor (7, and leads into-the conduit 8 which opens into the front of theair duct 6. The additional heater 7' is in this construction arranged-inthe hot'air supply pipe or duct 0 itself. The distribution of heat iscontrolled by hit and miss valves t and it operated through handles uand these can be so operated as to completely isolate the heataccumulator a, and by a simple sliding damper 'v, and if desired asliding damper orhit-and-miss valve w may be provided for furtherregulating the flow of air through the holes r. Moreover holes m with adamper or hit-and-miss valve 3 maybe provided at the lower end of theoven door 9. v

- In order to further control the distribution of the heat a duct oruptake a maybe provided leading from, or forming a con-v tinuation of,the hot air supply duct 0 and this uptake is providedwith dampers orvalves 1 which can be so operated as to'permit the hot air to bedelivered to any desired part of the oven d. For instance, if most heatis required at the lower part of the oven, the lowermost damper or valve1 is opened as shown, and'if most heat is required at the top or at anintermediate part of the oven, the uppermost damper of valve Z or anintermediate damper or valve l, respectively, is opened, the otherdampers being then closed. This uptake 2 is ofcourse not an essentialpart of the invention and may be dispensed with if desired, in whichcase the duct 0 would communicate direct with the oven 03. 1

The cooking or heating apparatus accord ing to this invention may, ifdesired, be provided with yet another and auxiliary electric heater 2placed, as shown in Figs. 1,

'2, 3 and 4, in the oven at near the top to provide top heat or to-heatquickly for a short time if necessary. The heaters j and 2 may beadapted to be switched on when required by means of switches 3 and 4re-' spectively and the main heater his switched on or off by a switch 5according to the load on the central station or to equalize the demandof the cooking apparatus. Further the apparatus may, as shown in Figs.3. and 4, be inelosed in a tank 6 for water which may be heated by anyheat escaping through the heat insulating material What I claim as newand desire to secure by Letters Patent, is:

1. The combination of an oven, an air heater for supplying heated airthereto provided with a heat storage mass having a passageway for theair therethrough de'flected.

at numerous places, whereby the air will be retarded in its passagethrough the air heater and will be brought frequently into contact withthe heated surfaces of the heat storage mass.

2. The combination of an air heater provided with a heat storagemass'having a passagewayfor the air therethrough deflected at numerousplaces, whereby the air will be retarded in its passage through theairheater and will be brought frequently into contact with the heatedsurfaces of the heat storage mass.

3. The combination of air heater proafded with a heat storage masshaving a series of projecting annular rings provided with holes arrangedin the difierent rings in staggered fashion, whereby the air will beretarded in its passage thrpugh the air heater and will be broughtfrequently into contact with the heated surfaces of the heat storagemass, an oven supplied with heated air from the air heater, and anelectrical heating element for heating the heat storage mass.

4. In a cooking device an air heater provided with a heat storage masshaving a solid core and a series of projecting anrihlar flanges orringsprovided with holes arranged in staggered fashion, whereby the airwill be retarded in its passage through the air heater and will bebrought frequently into contact with the heated surface of the heatstorage mass and its projecting rings.

5, Apparatus for heating air or other me-. dia for cooking or otherpurposes, comprissisting of a mass of a material capable of storing heatand belnga good conductor of heat, electrical means for heating saidmass,

.a duct in said mass through which the air or other medium to be heatedis adapted to pass, baffles in said duct so adapted as to proing incombination, a heat accumulator convide a zig-zag or tortuous path for.the air or other medium through said duct, a chamber serving as an ovenand connected by passages with both ends of said duct, and means forpromoting circulation of the air orother medium through said duct andsaid chamber, substantially as set forth.

.6. Apparatus for heating air or other media for cooking or otherpurposes, comprising in combination, a heat accumulator consisting of'amass of a material capable of storing heat and being a good conductorof.

heat, electrical means for heating said mass,-

a duct in said mass through which the air or other inedium to be heatedis adapted to pass, a chamber connected with both ends of said duct, andmeans for promoting circulation of the air or other medium through saidduct and said chamber, substantially as set forth.

7; Apparatus for heating air or other media for cooking or otherpur-poses,{ cpmpr"ising in combination, a heat accumulator .consistingof a mass of a material capable of storing heat and being a goodconductor of heat, electrical means for heating said mass, a duct insaidmass through which the air or other medium to be heated is adapted topass, a chamber connected with both ends of said duct, and electricalmeans for promoting circulation of the air or other medium through saidduct and said chamber, substantially as set forth.

' other medium to be heated. is adapted to pass, a chamber serving as anoven arranged above said mass, a passage connecting one end of said ductwithsaid chamber, a'pas-' sage connecting the other end of said ductwith saidchamber, an auxiliary' electric heating means in said chamberand auxiliary means in one of said passages'for promoting circulationof'the air or other medium through salid duct and said chamber,substantially as set forth,

9. The combination of an oven, an air heater, arranged below the oven,an electrical heating element for the air heater, a vent;- cal air flueleading fromthe air heater to the oven, an electrical heating element arranged in the flue, and means for cutting the electrical heating elementfor the air heater out of operation and the electrical heating elementin the vertical flue into operation for'heating the air therein and forstarting and maintaining an upward flow of heated air therein.

10. The combination of an oven, an air heater provided with a heatstorage mass arranged below the oven,-an electrical heating element forthe said heat storage mass, a vertical air flue leading from the airheater to the oven, an electrical heating elementarranged in the fluefor heating the air therein and for starting and maintaining an upwardflow of heated air therein, means for cutting one of the heatingelemntsinto operation and the other out of operation, and a returnpassage from the oven to the air heater for" the return to it of thespentheated air.

11. Apparatus for heating air or other media for cooking or otherpurposes, comprising in combination, a heat accumulator consisting of amass of a material capable of storing heat and being a good conductor ofheat, electrical means for heatingesaid mass a duct in said mass throughwhich the air or other medium to be heated is adapted to pass,'a chamberserving as an oven ar ranged above said mass, a passage connecting oneend of said duct with said chamber, a passage connecting the other endof said duct with said chamber, auxiliary means in one of said passagesfor promoting circulation of the air or other medium through said ductand said chamber, and means in the said passages for regulating thecirculation of the air or other'medium,--substantially as set forth.-

12. The combination of an oven, an air heater arranged 'below the oven,an electrical heating element for the air. heater, a -YrtlCll air flueleading from the air heater to the men, an QlQCtllCill' heating elementarranged in the flue for heating the air therein and for starting andmaintaining anupward fiow of heated air therein, and a return passagefrom the oven to the air heater for the return to it of the spentheatedair.

13. Apparatus for heating air or other media for cooking or otherpurposes,-co1nprising in combination, a heat accumulator consisting of amass of a material capable of storing heat and being a good conductor ofheat, electrical means for heating said mass, a duct in said massthrough which the air orother medium to be heated is adapted to pass, achamber serving as an oven and connected with one end. of said duct, anuptake in said chamber communicatin with the other end of said duct andadapte to be placed in communication with said chamber, means forregulating the supply of hot air or other medium from said uptakeinto-said chamber, and means for circulating the airor other mediumthrough said duct and,

said chamber, substantially as set forth 14. Apparatus for heating airor other media for cooking or other purposes,comprising in combination,a heat acumulator consi'sting of a mass of a material capableof storingheat and beinga good conductor of heat,

electrical means for heating said mass, a

'duct in said mass through whichthe air or other medium to be heated isadapted to pass, baflles in said duct so adapted as to provide a zig zagor tortuous path for'the air or other medium through said duct a chambenserving as an oven and arranged above said mass, an uptake in sai'dchamber communicating with one end ofsaid duet, means for controllingthe supply of hot air or other medium from said uptake into "id chamber,an inner door of said chamber; an outer door of said chamber, apassagebetween said doors, holes in said inner door to allow the airorother medium to pass from said chamber into said passage between saiddoors, means for regulating the flow of air or otherJnedium through saidholes, a conduit connecting the passage between said two doors with theotherjend of the said duct, electrical heating means;

in the first-named passage for promoting I circulation of the air orother medium through saidduct and said chamber, means, I in the saidpassages for regulating the circulation of the air or other "medium, anauxiliary heating means in said chamber, a coveringof heat insulatingmaterial surrounding said mass and said ehamber and a water jacketsurrounding said covering. of insulating "material, forth.

15. The combination of an 'oven, an air substantially as set heateifor-supplying heated air thereto, a door for the oven, an inclosed spaceoutside -'of the oven door, one or more openings in the oven door forthe escape of heated air '5 from the oven into such inclosed space,- a idoor in the wall of such inclosed space 0pposite the oven door, and areturn passage from the inclosed space to the air heater, whereby thespent heated. air may be used 10 to prevent undue cooling of the oven,esper cially when access is being hd .to the oren, and may be reheatedand used over again.

In testimony whereof, I have signed my name to this specification, inthe presence of O. J. WORTH,

H. D..JAMESQN.

